Boundary Layer Flow of Nanofluids past Some Geometrical Shapes Embedded in Porous Media

In this dissertation work the boundary layer flow of nanofluids past geometrical shapes such as wage, cylinder, disc, and cone embedded in porous media were studied. The physical problems of fluids flow are governed by highly nonlinear partial differen tial equations. Using suitable similarity transformations, the governing equations of flow were transformed into nonlinear higher order ordinary differential equations. Then, the computational solutions were obtained using recently developed numerical methods namely, Spectral quasilinearization method (SQLM) and Spectral relaxation method (SRM). The results of the study were compiled in the form of published pa pers on six different problems of incompressible fluid flow. In the study, nanopar ticles of Ag,CNTs,Al2O3,&Fe3O4 were also employed with water, ethylene glycol and Engine oil as the base fluids. Effects of embedded parameters such as magnetic f ield, viscous dissipation, nanoparticle volume fraction, Non-Newtonian fluid param eter, thermal radiation, pressure gradient, velocity and thermal slip effects, Cattaneo Christove heat flux Model, variable viscosity and thermal conductivity, and convec tive boundary condition on velocity, temperature and concentration distributions as well as skin friction coefficient, local heat and mass transfer rates were examined. The computational results were presented via embedded parameters with graphs and tables. The results revealed that the skin friction coefficient was improved while the local heat transfer rate was reduced with higher values of nanoparticle volume fraction, unsteadiness, viscous dissipation, Non-Newtonian Casson fluid, pressure gra dient, permeability, magnetic field, temperature and dependent viscosity parameters. Also, higher skin friction coefficient and lower local heat transfer rate were reported in the hybrid nanofluids than mono nanofluids. In addition, hybrid nanofluids show bet ter flow distributions with good stability of thermal properties than mono nanofluids. Thus, the obtained results are promising for the application of hybrid nanofluids in the nanotechnology sectors. Moreover, the accuracy of the solutions was checked against the previously published results and an excellent agreement were obtained. Finally, following the obtained results, conclusions and recommendations were indicated. Keywords: Boundary layer flow, Carbon nanotubes, Hybrid nanofluids, Porous media, Skin friction coefficient, Spectral collocation method.